Do You Need Strapping for Vinyl Siding?

The spaces and materials behind the vinyl dry out readily—even without strapping as a spacer. However, if you are installing vinyl or any other siding over thick rigid foam, strapping is needed as a nail base, even if it's not technically required as a drainage space.

Does vinyl siding require strapping?

Furring or strapping must be applied to create an even base for siding. ... As an alternative, solid sheathing can be applied directly over the old surface to create a smooth base, or over furring to provide even support for the vinyl siding.

What do you put under vinyl siding?

Vinyl siding can be installed over common wood sheathings such as plywood, oriented strand board (OSB), or other materials (e.g., foam plastic insulating sheathing). The thickness of wood sheathing counts toward the total thickness that the fasteners must penetrate into nailable material, usually 1 1/4” (32mm).